Noun
a rhythmical work song originally sung by sailors
Source: WordNet"Paddy on the Railway" is attested as a chanty in the earliest known published work to use the word "chanty", G. E. Clark's Seven Years of a Sailor's Life (1867). Source: Internet
This song is a sea chanty written no earlier than the 1820s, and so could not have been sung in 1815. Source: Internet